Its not that simple, for starters, even a NMW pays considerably more, around 400% more than a single persons UC, so incentive is there.
Parents with children & renting, get far more but should the children suffer because of the children? esp with a SENS diagnosis.
So lets take your young person not in work for 6months or more, maybe never worked? no one will employ them as they have no or little work history, no experience... maybe have anxiety? i wouldn't give them a job.
BUT luckily the Kings Trust did give the young man i know a chance, funded to work at M&S, loving it, independent, own money, sense of pride.
Perhaps M&S will take him on but either way this is the way forward for the long term unemployed, not calling them slackers and lazy arses.